Pneumatic casting pump



Jan. 28, v N E PNEUMATIC CASTING PUIP Filed April 6. 1928 2 Sheets-Sheet 1 Jan. 28, 1930. N. LESTER PNEUMATIC CASTING PUMP 2 sneet-sneet 2 Filed April 6, 1928 Patented Jan. 28, 1930 UNITED QSTATES NATHAN LESTER, OF WORCESTER, MASSACHUSETTS PNEUMATIC CASTING PUMP Application filed April 6, 1928. Serial No. 268,019.

This invention relates to a casting pump of the gooseneck variety principally for use in die casting machines.

The principal objects of the invention are to provide an improved motion for dipping the gooseneck into the molten metal in the pot and bringing it up out of the melting pot and into casting position; to provide an arrangement by which the motion of the parts and the setting of the nozzle into casting position will be independentof and unaffected by the expansion and contraction of the metal under different heat conditions, and to provide a construction in which the pump itself can be set down into a cradle forming a support therefor and removed therefrom readily without taking'out any of the rest of the mechanism. 7

The invention also involves improvements in features of construction and combinations of parts as will appear.

Reference is to be had to the accompanyin drawings in which ig. l is aside view of a melting pot and pneumatic pump in position for casting, constructed in accordance with this invention;

Fig. 2 is a plan of thesame;

Fig. 3 is a view similar to Fig. 1 showing the pneumatic pump drawn back from the dies and in position for filling it with molten metal;

Fig. 4 is a plan of the cradle and pump on enlarged scale showing details of construction;

V Fig. 5 is a central longitudinal sectional view on the line 5-5- of Fig. (1, but showing the pump itself in side elevation;

" Fig. 6 is a sectional view of a detail on the line 6-6 of Fig. 4, and I Fig. 7 is an end view of a detail as indicated by'the arrow 7 inFig. 3.

Although capable of other uses, the inventionis illustrated as cooperating with a melting furnace 10, a melting pot 11 and a wall 12 supporting one of the dies of a die casting machine. The dies and details of the 'mold are not illustrated herein as they do'not constitute a feature of this invention.

die member and to move therewith back and forth so that when the die is closed the rod ,will be moved to the position shown in Figs.

1 and 2. It operates a shaft 15 having a crank arm 14 connected to the rod by a bolt and slot connection 16. The shaft 15' is mounted in suitable bearings on a pair of slides 17. These slides are shown as having an inverted T-shape base freely movable in horizontal guides 18, which are mounted on the furnace.

The shaft 15 is provided with a crank arm 20 connected with a link 21 for operating the cradle The cradle is provided with a pair of rods or guides 19 fixed in collars 23 loosely. .mounted on the shaft. These rods provide .a

rigid straight line support for the cradle. At the other end these rods 19 are mounted in cylindrical lugs 24 on the cradle frame, which is slidable on the rods.

The cradle frame is provided with a lug 25 pivoted at the top by a pin 26 to a vertical.

link 27. This link, by a pin 28 is pivoted to an adjusting plate 29 having adjusting screws I;

:30 at either end adapted to rest down on the top of the furnace. This plate 29 is pivoted 26. The pin 26 serves as a movable support ing pivot for the cradle as will be seen from a comparison of Figs. 1 and 3. This supportr ing mechanism is located on one side of the furnace only but the two rods 19 both -rve the same purpose.

This cradle 22 is provided with a notch 32 for receiving the end of the pneumatic pump or gooseneck 33 and with screws 34 for adjusting the position thereof or rather tightening it in adjusted position. The cradle'22 is of a U-shaped construction,-the'two legs of which have open top notches 35 facing each other at their inner ends a1 adapted to receive'in them the ends of a pivot rod 36 which is partof the. gooseneck and is fixed thereto. Adjusting screws 37 pass through the end of the-legs of the cradle and adjust and hold the. pivot rod in central position. The height of the gooseneck is accurately adloo justed by screws 38, as shown in Fig. 6. The gooseneck is provided with a space for receiving the metal and with a metal discharge spout 41 and nozzle 39. This nozzle is adapted to fit against a conduit 40, which conducts the metal into the dies held on the back of the plate 12.

Also, at the top of the pneumatic pump is a cap 42. This cap is held on by a yoke 43 having a holding screw 44 and provided at the ends of its le s with hooks, not shown, extending inward y to hold the cap in posi tion. This cap has a conduit45 having a nozzle 46 fitting against a plate 47 and adapted to receive a supply of compressed air therethrough for operating the pump. This cap also has a guide 48 fitting guide pins 49 on the plate 12. I

In the operation of the device, when the mold closes, the rod 13 turns the shaft 15 to straighten out the toggle formed by the parts 20 and 21 into the position shown in Figs. 1 and 2. In this position the gooscneck comes to a vertical position and the two nozzles 39 and 46 register with the two plates40 and 47 so that air can be forced in through the latter and metal discharged into the mold through the former. The gooseneck is positively held in the proper position by the guides 48 and pins 49, as well as by the other mechanism above described, including the rods 19. When the mold opens and the rod 13 goes back, the shaft 15 is turned and the parts swing eventually to the position shown in Fig. 3. Here the crank arm 20 is swun upwardly and the link 21 brings the cradlelmck. The cradle swings on the combined system of pivots 26 and 28 and the nozzle 39 comes down into the position shown in Fig. 3 where it is under the level of the metal in the melting pot 11 and the gooseneck is filled by gravity.

In the construction of the parts it will be seen that the slides 17 are capable of moving back and forth freely so that expansion and contraction of the metal parts will not affect the action of this part of the device. The pump itself is easily removed from the cradle by loosening the screws 34 and 37 and just lifting it out. The other parts are easily disassembled. The screws 30 are adjusted to secure the necessary location of the gooseneck or pump for the purpose of filling the dies. This constitutes a simple motion for the gooseneck and provides ample guiding and adjusting devices for the purposes desired as well as ready detachability and safety from breakage due to expansion and contraction,

therein by any person skilled in the art without departing from the scope of the invention as expressed 1n the claims.

Therefore, I do not wish to be limited in these respects but what I do claim is 1. In a pneumatic metal pump, the combination with a shaft, freely slidable bearings on which the shaft is mounted and means for turning the shaft, of a cradle, a pneumatic pump carried by said cradle, and connections etween the cradle and shaft for swinging the pump from a depressed and inclined position for filling to a vertical position for discharging the metal.

2. n a pneumatic metal pump for die casting machines, the combination with a frame and a cradle carried thereby for supporting the pump, of a shaft having a crank thereon pivotally connected with said cradle for movmg the cradle and frame back and forth as .the shaft turns, guides connected with the shaft on which the frame is slidably supported near one end and a pivotal connection lvoted at a stationary point for additional y supporting said frame.

3. In a pneumatic metal pump for a die casting machine, the combination with a movable frame having a cradle thereon and means on the cradle for sup orting the pump, of a shaft having a cran connected with the cradle for moving the cradle and frame toward and from the shaft, a pair of guides radially connected with said shaft and slidably supporting said frame, a stationary pivot, and a link pivotally mounted on said p1vot and pivotally connected with said frame for controlling the motion of the pump as the frame moves back and forth on said guides.

4. In a pneumatic pump for a die casting machine, t 1e combination with a shaft having a crank thereon, and means for oscillating said shaft, of a link connected with said crank, a frame pivotally connected with the link, a pair of collars free to turn on said shaft, guide rods carried by saidcollars, said frame having passages therethrough for the rods and movable upon the rods, and means for pivotally supporting the frame at another point.

5. In a neumatic pump, the combination with a me ting pot having a stationary support, :1 lug projecting from said support, a pin connected with the lug, and a late pivotally mounted on said pin, of a lin t pivotally connected with said plate, means for ad'usting the ends of the plate up and down a out the first named pivot, a frame dependingfrom the upper end of said link and pivotally connected therewith, means for moving the frame back and forth and giving it a swinging motion, and a pneumatic pump carried by said frame.

6. In a device for filling dies with molten metal, the combination with a melting pot, of a pneumatic pump located above the same, adjustable means for pivotally mounting the pump over the pot, a leverage system for lowering the pum into-the pot and tilting it to allow it to e filled by gravity when submerged in the molten metal therein, said pump having two nozzles, one for discharging metal and the other for receiving air, a die plate having means for registering with both of said nozzles, supplying air to one, and receiving metal from the other, means for moving the cradle to bringthe pump from the position in the melting pot up into position to receive air and discharge metal, and means 7 pivotally connected with said cradle for movto support said latter means for free movement under all conditions of expansion and contraction.

7. In a casting .device, the combination with a melting pot, of an adjusting plate pivotally mounted thereon in substantially horizontal position, a link pivotally connected with said plate and extending upwardly therefrom, a cradle pivotally depending from the upper end of said link, said cradle being provided with rod receiving lugs, rods ex-- ing the cradle and frame back and forth as the shaft turns, freely slidable bearings on which the shaft and frame are slidably supported near one end and a pivotal connection pivoted at a stationary point for additionally supporting said frame.

9. In a pneumatic metal pump for a die casting machine,-the combination with a movable frame having a cradle thereon, and

means on the crade for supporting the pump, of a shaft having a crank connected with the cradle for moving'the cradle and frame toward and from the shaft, a pair of freely slidable hearings on which the shaftand frame are slidably supported, a stationary pivot, and a link pivotally mounted on said hearings on which said shaft, frame and guides are slidably supported, and a pivotal '7 connection pivoted at a stationary point for additionally supporting said frame.

11. I11 a pneumatic metal pump for a. die casting machine, the combination with a movable frame having' a cradle thereon, and means on the cradle for supporting the pump, of a shaft having a crank connected with the cradle for moving the cradle and frame toward and from the shaft, a pair of guides radially connected with said shafts and slidably supporting said frame, a pair of freely slidable bearings on which the shaft, frame and guides are slidably supported, a' stationary pivot, and a link pivotallymounted on said pivot and pivotally connected with said frame for controllingthe motion of the pump as thefram'e moves back and forth on said guides. y

In testimony whereof I have hereunto afiixed my signature.

, NATHAN LESTER.

pivot and pivotally connected to said frame for controlling the motion of the pump as the frame moves back and forthon said bearings.

Ina pneumatic metal pump for die casting machines, the combination with a.

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frame and a cradle carried thereby for supporting the pump, of a shaft having a crank thereon pivotally connected with said cradle for moving the cradle and frame back and forth as the shaft turns, guides connected with the shaft on which the frame is slidably supported near one end, freely slidable 

